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Most adults carry about 4.5–5.5 liters of blood, with body size, sex, and pregnancy shifting the range.

A standard whole-blood donation is about one pint (470 mL), plus a few small test tubes taken at the same time.

Most people lose 30–40 mL of blood per period, with total menstrual fluid often closer to 60–80 mL.

Most people lose 30–40 mL of blood per period, and loss over 80 mL is often classed as heavy bleeding.

Most periods add up to 30–80 mL of blood total, and “heavy” bleeding is often linked with totals above 80 mL per cycle.

A standard whole-blood donation is about one pint (around 450–470 mL), taken in roughly 5–10 minutes.

A standard whole-blood donation is about 1 pint (around 470 mL), plus a few small tubes taken for lab tests.

In many adults, losing around 40% of total blood volume can be fatal without rapid emergency care; faster bleeds can kill with less.

Most people lose about 30–60 mL of blood per period; over 80 mL often counts as heavy bleeding.

Most nosebleeds spill only a teaspoon to a tablespoon of blood, even when it looks like more.